決けっ定てい理り論ろんけっていりろんMeanings1noundecision theoryA branch of mathematics, economics, and philosophy that studies how choices are made under uncertainty. Used in fields like operations research, statistics, and AI.決けっ定てい理り論ろんは、不ふ確かく実じつな状じょう況きょうでの合ごう理り